Pulverizer



(No Model.)

l G. H. SMITH.

PULVERIZBR.

No. 481,532. I 'Patented Aug.-2s, 1892.

. mi mums wenns e0.. Mofo-mno., wlsmmon, D. c. A

UNITED STATES PATENT OFFICE.

GEORGE H. SMITH, OF CHICAGO, ILLINOIS.

PU LVERIZER.

SPECIFICATION forming part of Letters Patent No. 481,532, dated August28, 1892.

Application filed July 17, 1891. Serial No. 399,829. (No model.)

To all whom it may concern:

Be it known that LGEOEGE H. SMITH,a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Pulverizer, of which the following is aspecification.

My invention relates to means for pulverizing a great variety ofmaterials, but is speci ally intended for reducing to an im pal pablepowder metals or ores which are to be used in the manufacture of paintsof various kinds.

My object is to provide a machine which will reduce to a very iinecondition such metals as lead, tin, and zinc, which have a high degreeof ductility and which resist the ordinary means of grinding them to apowder, the machine being at the same time adapted to the reduction offriable materials, such as emery, corundum, and many kinds ofmetalliferous ores. I attain these objects by the construction shown inthe accompanying drawings, in which- Figure l is a side view withseveral parts broken away 0n line c b, Fig. 2. Fig. 2 is a view of theright-hand end of Fig. .1 as the machine appears when in operation andcharged with material to be pulverized.

Similar letters refer to like parts throughout the severaly views.

The frame is composed of heavy timbers. The sills A extend the wholelength of the machine and are connected by cross-sills A', Fig. 2.Mounted upon the top of the sills .is a rectangular frame, which iscomposed of side pieces B and end pieces' B. There is also a cross-pieceD, which connects the center of length of side pieces B. Thisrectangular frame is supported above the sills by heavy posts E. In thecenter of length and width of the base-frame formed by the sills is aheavy block F, which has three stepbearings to receive the lower ends ofthree shafts G, H, and I.

Journaled to the top rectangular frame is a horizontal shaft J, whichhas a driving-pulley J, to which a belt is applied to furnish power todrive the machine. The shaft .I has a position across the top frame in atransverse direction, and at its inner end is abevel-pinion K, whichgears with a large bevel-wheel L, which is secured to the top ofvertical shaft H, which shaft H is journaled in a box I-I, which issecured to the side of cross-timber D, giving the shaft a centralposition in the top frame composed of sides B and ends B. Near the lowerend of vertical shaft H is firmly secured a pinion M, which gears withlarge bevel-wheels G and I', which are firmly attached,respectively,toinclined shafts Gand I.

At the center of length of the end timbers B at the inside upper cornerare secured heavy boxes N and N', in which, respectively, shafts G and Iare journaled. At the top of each shaft G and I is a spider or broadiange O, firmly attached thereto, and to the top faces of these spidersare firmly attached by the bottoms the tubs P and P. On account of thegreat weight of the tubs and their contents and the comparatively highspeed which they must attain when in action rollers Q Q have beenprovided, which are journaled to heavy brackets R B', the bracketshaving a broad strong base, which is attached to the sills of themachine with bolts, as shown.

. Against the peripheries of these rollers Q and Q the tubs rest, therebeing two heavy bands S around each tub to form a track, against whichthe rollers have bearing. These bands may be of metal and the rollerscovered with some yielding material-such as rubber or leatherto preventthe roaring noise incident to the bands and rollers being both madeentirely of metal.

The brackets R and R by the pressure of the tubs against the rollerswould have a tendency to spread apart; but this is provided against bylong stay-bolts T, which connect the brackets and hold them firmly inposition.

The inside lining U of the tubs is tile, porcelain, glass, stone, or anysimilar material not easily affected by liquid chemicals in case it isnecessary to use them, and at the same time that will present a surfacewhich is not quickly worn away by the continued attrition of theparticles which are being reduced to a pulverulent state. The tubs areusually constructed of wood, and the lining in pieces is secured to theinside of the tubs by means of common wood-screws passing through holesin the lining and thence into the tubs. The lining, however, can be madeof cement or some other similar substance and plastered IOO in in a softstate, or the tubs can be made all or a part of metal, as may be foundnecessary 1n practice.

This machine was devised for the special purpose of reducing metalliclead or zin: to a fine powder as a preliminary step in the manufactureof the carbonate of lead or zinc, and in describing the operationthereof I will confine myself to lead, which has been one of the mostdifficult metals to reduce to a fine and even state of comminution onaccount of its high degree of ductility.

In operation the tubs are partially lled, as shown at V, in section,Fig. 1, with lead pellets of various sizes, from about onehalfinchdiameter down to the smallest that can be made, by the well-knownprocess of dropping molten lead into a tank of water. After suiicientquantity of lead pellets are in the tub enough water is introduced tomore than cover the lead pellets, when, power being applied to pulleyJ,it will be transmitted through ,the described train of cog-gearing andrevolve the tub or tubs. In the revolutions of the tubs, standing at aninclination, as they do, Fig. 1, the pellets of lead and the water arecarried by the frictional contact of the side and bottom of the liningof the tub above `their normal level toward the side to which the tub isrevolving; but the attraction of gravitation holds the pellets and waterfrom rising above a limited amount, which depends upon the velocity ofthe revolution of the tub, and the pellets while in this position arerolled against the lining and themselves and gradually worn away, theabraded particles mixing with the Water and undergoing astill `furtherreduction in size until they are reduced to a very fine state and heldin suspension in the water.

Revolving hemispherical or conical shaped vessels having their axisplaced on an incline similar to the tubs, hereinbefore described,orcylindrically-shaped vessels having their axis placed horizontally,could be used; but

I have found that tubs after the form herein shown and described andtheir axis inclined to an angle of about forty-five degrees from ahorizontal are preferable, since having the open top the interior isreadily accessible either to supply or remove material, and there is noobstruction to making an inspection of the condition of the contents ofthe tub at any time when the machine is in operation with little dangerto the attendant.

I claim as my invention- Y 1. In a pulverizer for reducing metals andminerals, a central motor, a multiple of vessels arranged around themotor and adapted to be operated thereby, each of said vessels havingits plane of revolution at an angle to a horizontal and adapted toreceive material to be operated upon and to carry it part way up theinclination formed by the sides and bottom of the Vessel, substantiallyas set forth.

2. In a pulverizer for reducing metals and minerals, a base-frame, arectangular frame mounted thereon, a support at each end of thebase-frame, provided with rollers, two ves- .sels mounted in the frames,each having its plane of revolution at an angle to a horizontal andadapted to bear against the rollers of the support at its respective endof the frame, and a central motor for operating said vessels,substantially as set forth.

3. In a pulverizer for reducing metals and minerals, a base-frame, arectangular frame mounted thereon, a block at the center of thebase-frame, provided with three step-bearings, a shaft journaled in eachbearing and in bearings upon the rectangular frame, a motor for thecentral shaft, and a vessel upon the upper end of each of the othershafts, the plane of `revolution of which is at au angle to ahorizontal, and a support for each vessel, substan tially as set forth.

" GEORGE H. SMITH. Witnesses:

W. R. ADAIT, O. E. THOMPSON.

